玉圭金臬

Explanation: Metaphor important criterion or testimonies. Gui, observing shadows instruments; provincial judge, target. Jin made it valuable. 　　Source: Leong Ching Wang, "two essays like autumn Temple Sacred Valley chapter phrase" move in "South Wenchao" Zhang Shan "Sacred Valley chapter," a saying if there is nuclear, meat and bone, the words in a material. Three languages, including every thrust, should be regarded as a rhetorical home Kyu Kim Yu-provincial judge. "